Imagination is the ability to form a mental image of something that is not perceived though the sense . It's the ability of the mind to build the mental scenes, things or events that do not exist, are not there or have even happened in past . Knowledge on the other hand is familiar , awareness or understanding gained though experience or study. Imagination is within us, and on the other hand knowledge is learnt though schooling and experience. Imagination motivates or rather leads us to acquire much more knowledge and to use it in creative ways and its because of this that we turned a rock into a spear a wheel into a circle , in other ways we wouldn't have evolved into the race we are today.
Pope Gregory IX was important because he named many new cardinals, established the medieval Inquisition, promulgated a code of canon law, and twice excommunicated Roman Emperor Frederick II.
